Ok so for about 4-5 months I've been seeing this guy and it got pretty serious, until a mutual friend showed me messages between him and multiple girls. I then went to talk to his best friend for help and his best friend told me that he cheated on me with 4 girls (had sex with them), and even went to see a girl right after hanging out with me. He even told him that after having sex with me he will break up with me. I was devastated, because I love him, and got high for the first time in 2 years. Things quickly escalated, and I kissed his best friend and another one of his friends. I feel really weird about it, and regret it. His best friend keeps texting me and inviting me to hang out and I don't know what to do... Please help!